City College of San Francisco DOWNTOWN CAMPUS ROOFING ADDENDUM NO. THREE

Transcription

1 City College of San Francisco DOWNTOWN CAMPUS ROOFING ADDENDUM NO. THREE PROJECT: Downtown Campus Roofing 800 Mission Street, San Francisco, CA DATE: December 10, 2014 OWNER: City College of San Francisco DSA FILE NO.: 38-C1 50 Phelan Avenue DSA APP. NO.: San Francisco, CA RESPONSE TO QUESTIONS 1. Item No. QA3-1 Question: I need clarification on what the safety requirements will be when working near the edge of the building? Especially when removing the rail system. Do we need to block the sidewalk down below when this work is taking place? Response: Neither the College nor the Architect are able to give advice on safety precautions, nor contractor's means and methods. Determining all safety requirements, and the means and methods to perform all work, are entirely the Contractors responsibility. Determine the cost for all safety provisions and all means and methods of construction and include it in the bid price. 2. Item No. QA3-2 Question: How much of the existing coating needs to be removed? What is acceptable? Response: The entire coating needs to be removed down to the substrate at all locations where the roof coating is replaced. 3. Item No. QA3-3 Question: The equipment located between Columns 3-5 Lines G & H including the cooling tower are to remain in place. The coating under this equipment can not be accessed. Please clarify, if we are to replace only the coating that can be access from the perimeter. Response: The intent is leave the inaccessible coating under the cooling tower in place. Do not remove inaccessible roof coating, and do not replace inaccessible roof coating. PROJECT MANUAL 1. Item No. PM3-1 Reference: Description: Appendix A Add Limited Asbestos and Lead Survey Report by RGA Environmental, the College s separate hazardous materials consultant. 18 pages. Not prepared by Hamilton+Aitken Architects. END OF ADDENDUM NO. THREE ADDENDUM THREE 10 DECEMBER 2014 PAGE 1 OF 1

2 December 8, 2014 Ms. Mariam Lam City College of San Francisco Facilities Planning and Construction 50 Phelan Avenue, B-606 San Francisco, CA RE: Limited Asbestos and Lead Survey Report Downtown Campus Roof 88 4 th Street San Francisco, California Dear Ms. Lam: RGA Environmental, Inc. (RGA) conducted a limited survey for suspect asbestos containing materials (ACMs) and lead containing paint associated with the roofing system of the City College of San Francisco Downtown Campus located at 88 Fourth Street in San Francisco, California. Matthew Chin, Certified Asbestos Consultant (CAC) with RGA conducted the survey on November 26, Seven (7) suspect asbestos materials were sampled during the survey. None of the materials were reported to contain asbestos. Table I below provides a summary of the results of the suspect asbestos bulk samples collected. The asbestos bulk samples were packaged and shipped under chain of custody to and analyzed by RGA Environmental Laboratory (RGA) in Seattle, Washington. RGA is accredited under the National Institute of Standards and Technology's National Voluntary Laboratory Accreditation Program (NVLAP) for analysis of asbestos in bulk materials. The asbestos samples were analyzed using polarized light microscopy (PLM) techniques in accordance with methodology approved by the U.S. Environmental Protection Agency (EPA). As set forth in the Code of Federal Regulations, 40 CFR Part 763, Appendix A to Subpart F, Section 1.2 and , the lower limit of reliability detection for asbestos using the PLM method is approximately one percent (1%) by volume. N:\RGAData\Production\CLIENT\C\City College of San Francisco (CCSF)\2014\Downtwon Campus - Roof Survey\CCSF_Downtown Campus Roof Srvy ACMPb Ltr Rpt.doc

3 Material Tan Rolled Roofing on Concrete Table I Asbestos Bulk Sample Results Waste Location(s) Category Result Estimated Quantity Lower Roof Field N/A ND N/A Roof Curbing Lower Roof Curbs N/A ND N/A Flashing Sealant/Mastic Penetration Mastic Black Roof Patch Mastic Fiberglass Roof Panels Roof Patch Flashing Seams at Upper and Lower Roof Fields Upper and Lower Roof Penetrations Upper Roof at South Side Upper Roof Elevator Equipment Shed Lower Roof at South Side N/A ND N/A N/A ND N/A N/A ND N/A N/A ND N/A N/A ND N/A CH = Chrysotile, ND = None Detected, RACM = Regulated asbestos containing material (friable), Cat. I = Category I Non-friable (note ACM must be reclassified as a RACM if rendered friable during removal), Cat. II = Category II Non-friable (note ACM must be reclassified as a RACM if rendered friable during removal), N/A = Not Applicable, sf = square feet Two (2) paint samples were collected from painted surfaces at the roof level of the building to determine potential presence of lead. Both samples were found to contain lead in concentrations above the laboratory detection limit. One (1) sample was found to be above the concentration of 5,000 parts per million (ppm), the threshold for lead-based paint. The lead sample results are listed in Table II below. The paint samples were analyzed for total lead by RGA in Seattle, Washington. RGA is accredited by the American Industrial Hygiene Association s (AIHA s) Environmental Lead Laboratory Accreditation Program (ELLAP) for the analysis of lead in paint chips, dust wipes, and/or soil. The paint sample was analyzed for lead content using Flame Atomic Absorption spectroscopy (FLAA) in accordance to EPA Method Table II Lead in Paint Sample Result Sample No. Description Location Result (ppm) Pb-01 Tan Paint on Metal Railing/Flashing Pb-02 Beige Paint on Corrugated metal Wall ppm = parts per million Lower Roof Field 420 Roof Penthouse Exterior 8,500 N:\RGAData\Production\CLIENT\C\City College of San Francisco (CCSF)\2014\Downtwon Campus - Roof Survey\CCSF_Downtown Campus Roof Srvy ACMPb Ltr Rpt.doc

4 RGA appreciates this opportunity to provide our hazardous materials consulting services to City College of San Francisco. If you have any questions or need additional information, feel free to call me at (510) Sincerely, RGA Environmental, Inc. Mike Bishop, CAC Senior Industrial Hygienist Kenneth Pilgrim, CAC # Project Manager Attachments: Laboratory Reports and Chain-of-Custody Forms - Asbestos and Lead, Figure 1 Sample Locations, Inspectors Certification N:\RGAData\Production\CLIENT\C\City College of San Francisco (CCSF)\2014\Downtwon Campus - Roof Survey\CCSF_Downtown Campus Roof Srvy ACMPb Ltr Rpt.doc

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